Grace Design m920 Stereo analog inputs - balanced (+4dBu) XLR and unbalanced (-10dBv) RCA; Two sets of line level outputs provided via RCA (unbalanced) and  TRS jacks (balanced) for connection to stereo monitors Ultra low distortion 32-bit /384khz Sabre DAC accepts stereo digital input source in AES3, S/PDIF, TOSLINK (optical) and USB formats with auto sample rate detection and digital de-emphasis filter USB for playback of up to 384kHz / 32 bit PCM as well as DSD64 and DSD128 playback via DoP Third generation s-Lock dual stage PLL (phase lock loop) circuitry for the ultimate in low jitter clocking and sonic integrity Apple IR remote control is supported with optional pairing; USB firmware upgradability and 5 Year transferable warranty on parts and labor